diff --git a/kokoro/linux/32-bit/build.sh b/kokoro/linux/32-bit/build.sh
deleted file mode 100755
index 5966f5c50e..0000000000
--- a/kokoro/linux/32-bit/build.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/bash
-#
-# This is the top-level script we give to Kokoro as the entry point for
-# running the "pull request 32" project:
-#
-# This script selects a specific Dockerfile (for building a Docker image) and
-# a script to run inside that image.
-
-set -ex
-
-# Change to repo root
-cd $(dirname $0)/../../..
-GIT_REPO_ROOT=$(pwd)
-
-CONTAINER_IMAGE=us-docker.pkg.dev/protobuf-build/containers/test/linux/32bit@sha256:6651a299483f7368876db7aed0802ad4ebf038d626d8995ba7df08978ff43210
-
-git submodule update --init --recursive
-use_bazel.sh 5.1.1
-sudo ./kokoro/common/setup_kokoro_environment.sh
-./regenerate_stale_files.sh
-
-gcloud components update --quiet
-gcloud auth configure-docker us-docker.pkg.dev --quiet
-
-docker run \
-  "$@" \
-  -v $GIT_REPO_ROOT:/workspace \
-  $CONTAINER_IMAGE \
-  bash -l "/workspace/kokoro/linux/32-bit/test_php.sh"
diff --git a/kokoro/linux/32-bit/common.cfg b/kokoro/linux/32-bit/common.cfg
deleted file mode 100644
index 28b66c07c2..0000000000
--- a/kokoro/linux/32-bit/common.cfg
+++ /dev/null
@@ -1,11 +0,0 @@
-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/32-bit/build.sh"
-timeout_mins: 120
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-  }
-}
diff --git a/kokoro/linux/32-bit/continuous.cfg b/kokoro/linux/32-bit/continuous.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/32-bit/continuous.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/32-bit/presubmit.cfg b/kokoro/linux/32-bit/presubmit.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/32-bit/presubmit.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/32-bit/test_php.sh b/kokoro/linux/32-bit/test_php.sh
deleted file mode 100644
index ef973379e6..0000000000
--- a/kokoro/linux/32-bit/test_php.sh
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/bin/bash
-
-set -eux
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-use_php() {
-  VERSION=$1
-  export PATH=/usr/local/php-${VERSION}/bin:$PATH
-}
-
-build_php() {
-  use_php $1
-  pushd php
-  rm -rf vendor
-  php -v
-  php -m
-  composer update
-  composer test
-  popd
-}
-
-test_php_c() {
-  pushd php
-  rm -rf vendor
-  php -v
-  php -m
-  composer update
-  composer test_c
-  popd
-}
-
-build_php_c() {
-  use_php $1
-  test_php_c
-}
-
-mkdir -p build
-pushd build
-cmake .. -DCMAKE_CXX_STANDARD=14
-cmake --build . -- -j20
-ctest --verbose --parallel 20
-export PROTOC=$(pwd)/protoc
-popd
-
-git config --global --add safe.directory "*"
-
-build_php 7.4
-build_php 8.0
-build_php_c 7.4
-build_php_c 8.0
-build_php_c 7.4-zts
-build_php_c 8.0-zts
-
-# Cleanup after CMake build
-rm -rf build
diff --git a/kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh b/kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh
deleted file mode 100755
index 3e8bc4298e..0000000000
--- a/kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-# go to the repo root
-cd $(dirname $0)/../../../..
-GIT_REPO_ROOT=`pwd`
-
-if [[ -t 0 ]]; then
-  DOCKER_TTY_ARGS="-it"
-else
-  # The input device on kokoro is not a TTY, so -it does not work.
-  DOCKER_TTY_ARGS=
-fi
-
-# Pin the dockcross image since newer versions of the image break the build
-# We use an older version of dockcross image that has gcc4.9.4 because it was built
-# before https://github.com/dockcross/dockcross/pull/449
-# Thanks to that, wheel build with this image aren't actually
-# compliant with manylinux2014, but only with manylinux_2_24
-PINNED_DOCKCROSS_IMAGE_VERSION=quay.io/pypa/manylinux2014_aarch64:2022-12-10-a8f854a
-
-# running dockcross image without any arguments generates a wrapper
-# scripts that can be used to run commands under the dockcross image
-# easily.
-# See https://github.com/dockcross/dockcross#usage for details
-docker run -v $GIT_REPO_ROOT:/workspace --rm $PINNED_DOCKCROSS_IMAGE_VERSION /bin/bash -c "cd /workspace; git config --global --add safe.directory '*'; $@"
diff --git a/kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh b/kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh
deleted file mode 100755
index bcb3d9dd94..0000000000
--- a/kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-# Install composer
-curl -sS https://getcomposer.org/installer | php
-mkdir -p "$HOME/bin"
-mv composer.phar "$HOME/bin/composer"
-PATH="$HOME/bin:$PATH"
-
-# go to the repo root
-cd $(dirname $0)/../../..
-
-cd php
-
-composer install
-composer test
-composer test_c
diff --git a/kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh b/kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh
deleted file mode 100755
index 7f07968d9a..0000000000
--- a/kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/bin/bash
-#
-# Builds protobuf C++ with aarch64 crosscompiler.
-
-set -ex
-
-cmake -DCMAKE_POSITION_INDEPENDENT_CODE=ON -Dprotobuf_WITH_ZLIB=0 -Dprotobuf_BUILD_TESTS=OFF .
-make -j8
diff --git a/kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh b/kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh
deleted file mode 100755
index f61320222a..0000000000
--- a/kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/bin/bash
-#
-# Setup and configure qemu userspace emulator on kokoro worker so that we can seamlessly emulate processes running
-# inside docker containers.
-
-set -ex
-
-# show pre-existing qemu registration
-cat /proc/sys/fs/binfmt_misc/qemu-aarch64
-
-# Kokoro ubuntu1604 workers have already qemu-user and qemu-user-static packages installed, but it's and old version that:
-# * prints warning about some syscalls (e.g "qemu: Unsupported syscall: 278")
-# * doesn't register with binfmt_misc with the persistent ("F") flag we need (see below)
-#
-# To overcome the above limitations, we use the https://github.com/multiarch/qemu-user-static
-# docker image to provide a new enough version of qemu-user-static and register it with
-# the desired binfmt_misc flags. The most important flag we need is "F" (set by "--persistent yes"),
-# which allows the qemu-aarch64-static binary to be loaded eagerly at the time of registration with binfmt_misc.
-# That way, we can emulate aarch64 binaries running inside docker containers transparently, without needing the emulator
-# binary to be accessible from the docker image we're emulating.
-# Note that on newer distributions (such as glinux), simply "apt install qemu-user-static" is sufficient
-# to install qemu-user-static with the right flags.
-docker run --rm --privileged multiarch/qemu-user-static:5.2.0-2 --reset --credential yes --persistent yes
-
-# Print current qemu reqistration to make sure everything is setup correctly.
-cat /proc/sys/fs/binfmt_misc/qemu-aarch64
diff --git a/kokoro/linux/aarch64/ruby_build_and_run_tests_with_qemu_aarch64.sh b/kokoro/linux/aarch64/ruby_build_and_run_tests_with_qemu_aarch64.sh
deleted file mode 100755
index dc093bc96a..0000000000
--- a/kokoro/linux/aarch64/ruby_build_and_run_tests_with_qemu_aarch64.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-# go to the repo root
-cd $(dirname $0)/../../..
-
-gem install bundler
-
-cd ruby
-
-bundle
-rake
-rake clobber_package gem
-
-# run all the tests
-rake test
diff --git a/kokoro/linux/aarch64/test_csharp_aarch64.sh b/kokoro/linux/aarch64/test_csharp_aarch64.sh
deleted file mode 100755
index cc3bffe04d..0000000000
--- a/kokoro/linux/aarch64/test_csharp_aarch64.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-# go to the repo root
-cd $(dirname $0)/../../..
-
-if [[ -t 0 ]]; then
-  DOCKER_TTY_ARGS="-it"
-else
-  # The input device on kokoro is not a TTY, so -it does not work.
-  DOCKER_TTY_ARGS=
-fi
-
-# First, build protobuf C# tests under x86_64 docker image
-# Tests are built "dotnet publish" because we want all the dependencies to the copied to the destination directory
-# (we want to avoid references to ~/.nuget that won't be available in the subsequent docker run)
-CSHARP_BUILD_COMMAND="dotnet publish -c Release -f net60 csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj"
-docker run $DOCKER_TTY_ARGS --rm --user "$(id -u):$(id -g)" -e "HOME=/home/fake-user" -e "DOTNET_CLI_TELEMETRY_OPTOUT=true" -e "DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true" -v "$(mktemp -d):/home/fake-user" -v "$(pwd)":/work -w /work mcr.microsoft.com/dotnet/sdk:6.0.100-bullseye-slim bash -c "$CSHARP_BUILD_COMMAND"
-
-# Use an actual aarch64 docker image to run protobuf C# tests with an emulator. "dotnet vstest" allows
-# running tests from a pre-built project.
-# * mount the protobuf root as /work to be able to access the crosscompiled files
-# * to avoid running the process inside docker as root (which can pollute the workspace with files owned by root), we force
-#   running under current user's UID and GID. To be able to do that, we need to provide a home directory for the user
-#   otherwise the UID would be homeless under the docker container and pip install wouldn't work. For simplicity,
-#   we just run map the user's home to a throwaway temporary directory
-CSHARP_TEST_COMMAND="dotnet vstest csharp/src/Google.Protobuf.Test/bin/Release/net60/publish/Google.Protobuf.Test.dll"
-docker run $DOCKER_TTY_ARGS --rm --user "$(id -u):$(id -g)" -e "HOME=/home/fake-user" -e "DOTNET_CLI_TELEMETRY_OPTOUT=true" -e "DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true" -v "$(mktemp -d):/home/fake-user" -v "$(pwd)":/work -w /work mcr.microsoft.com/dotnet/sdk:6.0.100-bullseye-slim-arm64v8 bash -c "$CSHARP_TEST_COMMAND"
diff --git a/kokoro/linux/aarch64/test_php_aarch64.sh b/kokoro/linux/aarch64/test_php_aarch64.sh
deleted file mode 100755
index 3eb8fa45e2..0000000000
--- a/kokoro/linux/aarch64/test_php_aarch64.sh
+++ /dev/null
@@ -1,33 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-# go to the repo root
-cd $(dirname $0)/../../..
-
-git submodule update --init --recursive
-
-# there is no php testing docker image readily available, so we build
-# our own. It's a aarch64 image, but that's fine since qemu will
-# automatically be used to run the commands in the dockerfile.
-docker build -t testimage_protobuf_php_arm64v8 kokoro/linux/aarch64/testimage_protobuf_php_arm64v8
-
-if [[ -t 0 ]]; then
-  DOCKER_TTY_ARGS="-it"
-else
-  # The input device on kokoro is not a TTY, so -it does not work.
-  DOCKER_TTY_ARGS=
-fi
-
-# crosscompile protoc as we will later need it for the php build.
-# we build it under the dockcross/manylinux2014-aarch64 image so that the resulting protoc binary is compatible
-# with a wide range of linux distros (including any docker images we will use later to build and test php)
-kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh
-
-# use an actual aarch64 docker image (with a real aarch64 php) to run build & test protobuf php under an emulator
-# * mount the protobuf root as /work to be able to access the crosscompiled files
-# * to avoid running the process inside docker as root (which can pollute the workspace with files owned by root), we force
-#   running under current user's UID and GID. To be able to do that, we need to provide a home directory for the user
-#   otherwise the UID would be homeless under the docker container and pip install wouldn't work. For simplicity,
-#   we just run map the user's home to a throwaway temporary directory
-docker run $DOCKER_TTY_ARGS --rm --user "$(id -u):$(id -g)" -e "HOME=/home/fake-user" -v "$(mktemp -d):/home/fake-user" -v "$(pwd)":/work -w /work testimage_protobuf_php_arm64v8 kokoro/linux/aarch64/php_build_and_run_tests_with_qemu_aarch64.sh
diff --git a/kokoro/linux/aarch64/test_ruby_aarch64.sh b/kokoro/linux/aarch64/test_ruby_aarch64.sh
deleted file mode 100755
index e256e4edcc..0000000000
--- a/kokoro/linux/aarch64/test_ruby_aarch64.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-# go to the repo root
-cd $(dirname $0)/../../..
-
-if [[ -t 0 ]]; then
-  DOCKER_TTY_ARGS="-it"
-else
-  # The input device on kokoro is not a TTY, so -it does not work.
-  DOCKER_TTY_ARGS=
-fi
-
-# crosscompile protoc as we will later need it for the ruby build.
-# we build it under the dockcross/manylinux2014-aarch64 image so that the resulting protoc binary is compatible
-# with a wide range of linux distros (including any docker images we will use later to build and test ruby)
-kokoro/linux/aarch64/dockcross_helpers/run_dockcross_manylinux2014_aarch64.sh kokoro/linux/aarch64/protoc_crosscompile_aarch64.sh
-
-# use an actual aarch64 docker image (with a real aarch64 ruby) to run build & test protobuf ruby under an emulator
-# * mount the protobuf root as /work to be able to access the crosscompiled files
-# * to avoid running the process inside docker as root (which can pollute the workspace with files owned by root), we force
-#   running under current user's UID and GID. To be able to do that, we need to provide a home directory for the user
-#   otherwise the UID would be homeless under the docker container and pip install wouldn't work. For simplicity,
-#   we just run map the user's home to a throwaway temporary directory
-
-docker run $DOCKER_TTY_ARGS --rm --user "$(id -u):$(id -g)" -e "HOME=/home/fake-user" -e "PROTOC=/work/protoc" -v "$(mktemp -d):/home/fake-user" -v "$(pwd)":/work -w /work arm64v8/ruby:2.7.3-buster kokoro/linux/aarch64/ruby_build_and_run_tests_with_qemu_aarch64.sh
diff --git a/kokoro/linux/aarch64/testimage_protobuf_php_arm64v8/Dockerfile b/kokoro/linux/aarch64/testimage_protobuf_php_arm64v8/Dockerfile
deleted file mode 100644
index eae1bbc4bd..0000000000
--- a/kokoro/linux/aarch64/testimage_protobuf_php_arm64v8/Dockerfile
+++ /dev/null
@@ -1,3 +0,0 @@
-FROM arm64v8/debian:buster
-
-RUN apt-get update && apt-get install -y php7.3-cli php7.3-dev php7.3-bcmath composer phpunit curl git valgrind && apt-get clean
diff --git a/kokoro/linux/csharp_aarch64/build.sh b/kokoro/linux/csharp_aarch64/build.sh
deleted file mode 100755
index 2b8321f648..0000000000
--- a/kokoro/linux/csharp_aarch64/build.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/bash
-#
-# This is the top-level script we give to Kokoro as the entry point for
-# running the "continuous" and "presubmit" jobs.
-
-set -ex
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-# Initialize any submodules and regenerate files
-git submodule update --init --recursive
-use_bazel.sh 5.1.1
-sudo ./kokoro/common/setup_kokoro_environment.sh
-./regenerate_stale_files.sh
-
-kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh
-
-kokoro/linux/aarch64/test_csharp_aarch64.sh
diff --git a/kokoro/linux/csharp_aarch64/common.cfg b/kokoro/linux/csharp_aarch64/common.cfg
deleted file mode 100644
index df28ef368f..0000000000
--- a/kokoro/linux/csharp_aarch64/common.cfg
+++ /dev/null
@@ -1,11 +0,0 @@
-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/csharp_aarch64/build.sh"
-timeout_mins: 120
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-  }
-}
diff --git a/kokoro/linux/csharp_aarch64/continuous.cfg b/kokoro/linux/csharp_aarch64/continuous.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/csharp_aarch64/continuous.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/csharp_aarch64/presubmit.cfg b/kokoro/linux/csharp_aarch64/presubmit.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/csharp_aarch64/presubmit.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/php_aarch64/build.sh b/kokoro/linux/php_aarch64/build.sh
deleted file mode 100755
index bc2d60ea18..0000000000
--- a/kokoro/linux/php_aarch64/build.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/bash
-#
-# This is the top-level script we give to Kokoro as the entry point for
-# running the "continuous" and "presubmit" jobs.
-
-set -ex
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-# Initialize any submodules and regenerate files.
-git submodule update --init --recursive
-use_bazel.sh 5.1.1
-sudo ./kokoro/common/setup_kokoro_environment.sh
-./regenerate_stale_files.sh
-
-kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh
-
-kokoro/linux/aarch64/test_php_aarch64.sh
diff --git a/kokoro/linux/php_aarch64/common.cfg b/kokoro/linux/php_aarch64/common.cfg
deleted file mode 100644
index ff20682dfb..0000000000
--- a/kokoro/linux/php_aarch64/common.cfg
+++ /dev/null
@@ -1,11 +0,0 @@
-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/php_aarch64/build.sh"
-timeout_mins: 120
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-  }
-}
diff --git a/kokoro/linux/php_aarch64/continuous.cfg b/kokoro/linux/php_aarch64/continuous.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/php_aarch64/continuous.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/php_aarch64/presubmit.cfg b/kokoro/linux/php_aarch64/presubmit.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/php_aarch64/presubmit.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/ruby_aarch64/build.sh b/kokoro/linux/ruby_aarch64/build.sh
deleted file mode 100755
index 5306c03013..0000000000
--- a/kokoro/linux/ruby_aarch64/build.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/bash
-#
-# This is the top-level script we give to Kokoro as the entry point for
-# running the "continuous" and "presubmit" jobs.
-
-set -ex
-
-# Change to repo root
-cd $(dirname $0)/../../..
-
-# Initialize any submodules and regenerate files.
-git submodule update --init --recursive
-use_bazel.sh 5.1.1
-sudo ./kokoro/common/setup_kokoro_environment.sh
-./regenerate_stale_files.sh
-
-kokoro/linux/aarch64/qemu_helpers/prepare_qemu.sh
-
-kokoro/linux/aarch64/test_ruby_aarch64.sh
diff --git a/kokoro/linux/ruby_aarch64/common.cfg b/kokoro/linux/ruby_aarch64/common.cfg
deleted file mode 100644
index ae82696404..0000000000
--- a/kokoro/linux/ruby_aarch64/common.cfg
+++ /dev/null
@@ -1,11 +0,0 @@
-# Config file for running tests in Kokoro
-
-# Location of the build script in repository
-build_file: "protobuf/kokoro/linux/ruby_aarch64/build.sh"
-timeout_mins: 120
-
-action {
-  define_artifacts {
-    regex: "**/sponge_log.xml"
-  }
-}
diff --git a/kokoro/linux/ruby_aarch64/continuous.cfg b/kokoro/linux/ruby_aarch64/continuous.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/ruby_aarch64/continuous.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.
diff --git a/kokoro/linux/ruby_aarch64/presubmit.cfg b/kokoro/linux/ruby_aarch64/presubmit.cfg
deleted file mode 100644
index 8523c22536..0000000000
--- a/kokoro/linux/ruby_aarch64/presubmit.cfg
+++ /dev/null
@@ -1 +0,0 @@
-# Keep this file empty! Use common.cfg instead.